Process of making metal bands or rings



W. R. CARROLL.

PROCESS OF MAKING METAL BANDS 0R RINGS.

APPLICATION' FILED JAN. 5', 1918.

l, 35 1 202. Patented Aug. 31, 1920.

I L 9 7 Fi I Z7 l9 L? 7 2 5/ WI u- I Cmi'ou A r-L hit WILLARD R.CARROLL, DIE DER-BY, CONNECTICUT.

PROCESS OF MAKING METAL BANDS B RINGS.

Specification of Letters Patent.

Patented Aug. at, man,

Application filed January 5, 1918. Serial No. 210,422.

To all whom it may concern:

Be it known that I, WILLARD R. CAR- ROLL, a citizen of the UnitedStates, residing at Derby, in the county of New Haven and State ofConnecticut, have invented certain new and useful Improvements inProcesses of Making Metal Bands or Rings, of which the foll wing is aspecification, reference being had therein to the accompanying drawings.

his invention relates to the manufacture of rings, annular bands or thelike, of metal, having ductility, which will permit of its shape beingchanged by means of the metal drawing process forming the subject matterof the present invention. a

The object of my improved process, among other things, is to producefrom substantially flat metal, at a minimum of cost, material and labor,perfectly finished articles that are uniform in size and shape.

An embodiment of the invention will be hereinafter described withreference to the accompanying drawing, wherein,

Figure 1 shows in perspective a perforated disk which is produced by anysuitable means in the first operation of my improved process;

ig. 2 is a sectional View illustrating a form of punch and die employedin the second operation of theprocess with a blank, substantially asshown in Fig. 1, positioned upon the die;

Fig. 3 is a perspective view of the article after the second operationthereon;

Fig. 4 is a sectional view illustrating a form of punch and die employedin the third operation with one of the articles in section, positionedtherebetween, and showing the punch by both full and broken lines in twoof its positions;

Fig. 5 is a perspective view of the article after the third operation; I

Fig. 6 is a sectional view illustrating a form of punch and die employedfor a subsequent sizing or finishing of the article produced by thethird operation; and

Fig. 7 is a, sectional view of a punch and die whereby a coniform ringor annulus is produced by the process Tn carrying out my invention Iemploy a series of improved punch and die sets,

which may be used in a single press or in dliferent presses, or in anysuitable manner as may be desired.

The improved process commences by producing by any well known means, ablank or disk 1, having a perforation 2 therethrough, the diameter ofwhich is based upon the dimensions of the finished article.

The second operation consists in transforming the blank or disk 1 into acone shaped band or ring 3, having sides that taper away from a pointbetween the ends thereof and toward each other, whereby it is thicker at4 than at any other point, with the metal at the end 23 being thinnerthan at the end 24. The tools for efiecting this operation consist inpart of a punch 5 having a shank 6, by means of which the punch is heldin a movable member (not shown) of a press, or similar mechanism. Thispunch is provided with a cone portion 7 having two angles of inclinationseparated by a line of demarcation numeral 9, that terminates in aportion 8 of uniform diameter. The die 10, having a guide plate 11adjacent thereto, for determining the position of the blank is mountedin a holder or bed 12 in any suit able manner. Through the die is arecess 13 opposite an opening 14 in the bed 12 and having an outwardlyflaring throat, formed by the two tapered surfaces 15 of substantiallyuniform length but with difierent angles of inclination that join at apoint designated by the numeral 16. in the operation concentricdesignated by the of this punch and die, the punch 8 enters theperforation 2 and forces the blank or disk 1 into the tapered throat inthe die, thus shaping the blank into a coniform ring or annulussubstantially as shown in Figs. 3 and l, thickened at a point,designated a, between the ends thereof, to substantially the samethickness as the finished article. Tnstead of thickening the ring so asto leave an excess of stock both on the outside and inside of the ring,as shown in Figs. 3and l, the expansion of the metal may be on one sideonly, for example, on the outside, as shown in Fig. 7. At the conclusionof this operation the ring is ejected from the die 10 by any wellv knownform of lmockout mechanism operating through the opening ever,preferable to ameter substantially 14 and recess 13. In the nextoperation I employ a punch having a substantially cylindrical portion 18with a rounded corner 25 and a stripper sleeve 27 thereon, which alsoprovides a shoulder 19 against which abuts the end 23 of the ring. Thesleeve 27 is slidable .upon the cylindrical portion 18 and in themovement of the punch in one direction is held in a fixed positionthereon. The mechanism for controlling the movement of said sleeve isold and well knownin the art, and therefore is not shown or describedherein. A fixed collar 20, substantially as shown in Fig. 2, may besubstituted for the sleeve, if desired. It is, howemploy a movablesleeve in this operation, because said sleeve can be utilized to forcethe blank off the punch While the same is being Withdrawn from the die40. Through this die is an opening, the portion 21 thereof beingtapered, with a flaring throat or ledge 22 and the lower portion 13straight, the latter registering with the opening 14 in the bed 12. Inthis operation the ring 3 is placed with its thicker and larger end 24upon this ledge, thus being inverted relatively to that position inwhich it was formed by the preceding operation, and its thinner end 23against the shoulder 19. 'When pressure is first applied, the end 24 isgradually reduced in diameter and moves inwardly toward the punch 18 byreason of the flaring throat or ledge 22 and the tapered portion 21 ofthe die opening. Thereafter the continued application of the pressurecauses the metal to flow upwardly toward the end 23 and outwardlyadjacent to this same end, so as to permit the end 24 to enter thestraight portion 13 of the die opening, and as it passes therethroughthe ring is transformed into one having substantially parallel sideswith an inside dithe same as that of the punch 18, and an outsidediameter substantially the same as the diameter of the strai ht portion13. The metal at the end 23 o the coniform ring is of less thicknessthan the width of the shoulder 19, therefore a considerable shoulder canbe accommodated during this operation before the outer edge of the ringis flush with the outer surface of the collar 20 or sleeve 27. Thisarrangement of the coniform ring in the die and punch permits of theflow of metal to this end so as .to bring the thickness of the finishedarticle at this point substantially the-same as that portion of the ringdesignated 4, and no excess of material is permitted to crowd over theshoulder 19 to form a fin on the ring and project around said shoulder,thus marring the ring and requiring another operation to remove the finand subjecting the punch and die to a. possible breakage by reason ofthe flow of metal toward this excess material being in a place for whichno room has been previously provided.

The aforesaid compression or upsetting of the ring causes the excessmetal at the thicker end and intermediate portion of the ring to flowupwardly, producing a straight sided ring in the rough, and thisfacilitates the final drawing through the straight portion 13, whichproducesthe finished ring 26 having substantially straight sides orsides of equal thickness at the top and bottom.

In an additional operation the ring 26 may be further sized with agreater nicety and also smoothed at all points to produce a highlyfinished article. The punch used in this operation is substantially thesame as that used with the preceding operation except that the end 25 isnot rounded. The die 50 therefor has a recess 30 therein of uniformdiameter to receive the ring 26, and at the bottom thereof is an ejector31 having a recess 32 in its upper surface of substantially the samediameter as the punch 18, and the flange 33 thereon is of substantiallythe same diameter as the collar 20 on the punch. In this operation thering is sized asfollows: the inside by the portion 18 of the punch, theoutside by the recess 30 and the ends by the shoulder 19 on the punchand the ejector flange 33,

This operation produces a ring of very exact predetermined dimensions aswell as imparting thereto a high'finish. Thev ring 26 is stripped fromthe die by the ejector 31 operated in any well known manner.

For some classes of work the article as shown in Fig. 5 is sufficientlycomplete without any subsequent operation, in which case the lastdescribed operation is omitted.

A ring in which the sides are not parallel or of equal thickness may beproduced by the process, for example, as illustrated in Fig. 7. Hereinthe punch 38 and the die 39 are modified for the purpose of making afinished coniform ring '37, shown in broken lines, instead of a ringhavin substantially parallel sides, as shown in ig. 5. The constructionof this punch and die set are substantially the same as hereinbeforedescribed, with the exception tion 38 of the punch and the walls of therecess 21 in the die are substantially parallel with each other.

Having described my invention, what I that the por- 7.

claim as new and desire to secure by Letters i.

Patent, is

1. The process of making annular shaped articles from sheet metalconsisting in forming a perforated disk of substantially uniformthickness and shaping. said disk into a coniform ring or band, the endsthereof being of less thicknesses than a point between sa d ends andfinally shaping said ring or band into an article having ends and pointbetween the ends than at the ends sides of substantially uniformthickness. thereof; and thirdly, upsetting said conical 2. In themanufacture of articles of the ring to form a ring having substantially10 character described, firstly, producing a parallel-sides. 5perforated disk of substantially uniform In testimony whereof I havehereunto thickness; secondly, upsetting said disk to afiiXed mysignature. form a conical ring that is thicker at a WILLARD R. CARROLL.

